Volvo Repair: timing belt, o clock, timing belt

Question
i want to know how to align the timing its a 1991 740 se
three pulleys in vertical right off set(two vertical and one on bottom on fan axle if can help ....i would like to learn more?

Answer
There are marks for all three. Cam and Aux shafts have dots on face of outer gear. Cam lines up with mark on rear timing cover(about 1 o'clock). Aux lines up with mark on seal housing (about 3 o'clock) and crank lines up with mark on seal housing (about 12 o'clock)